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comment Maple: Substitution in PDE to reduce number of independents
I suppose that it's awkward to help when you didn't provide the values for PDE and equation, posted invalid syntax Maple code: braces instead of brackets, missing multiplication symbols following symbols a, b, c and lambda, powering unknown name e instead of using command exp, sove for solve, and so on. Perhaps consider uploading an actual worksheet to the www.mapleprimes.com user forum.
Apr
21
answered Evaluating large expression with differential equations constraints
Apr
21
comment Maple to solve differential equations
Create the list of lists made via [seq([tval[i],Y1val[i]],i=0..nmax)] and check that it truly is a list of lists of pairs of numeric values. We do not have access to your 3rd party RungeKuttaIVP_2D command. But how does it assign values into tval and Y1val? Are you saying that your command assigns to those global names as merely a side-effect?? Note that the error message you obtained will occur if tval and Y1val are still unassigned! Perhaps you are supposed to assign the results from RungeKuttaIVP_2D to those names?
Apr
19
answered Formal expansion of matrices using Maple or Mathematica
Apr
18
answered How can I get a list of large numbers in decimal form in maple?
Apr
5
comment How to plot the differential equation in spherical coordinates with maple
One of the terms in your Maple code for sys has sin(phi(t)) in the denominator, but your corresponding inlined formula has it as sin(theta(t)) instead (as pointed out by Preben Alsholm on www.mapleprimes.com).
Mar
23
comment Maple - PDE substitution
You should not have received that error message if you have indeed executed the line of code (above) which assigned to s2. Perhaps you omitted that line of the above code? I suggest trying it first by issuing restart and then running all those code lines above, in order.
Mar
23
comment Maple - PDE substitution
You can also try some variant of the following command, before the above Maple code, if you'd like derivatives wrt xi to be typeset with prime notation, or arguments to various function calls to be suppressed, or partials of u(x,t) to be typeset with subscript notation, etc. PDEtools[declare](xi(x,t), F(xi), prime=xi);
Mar
22
answered Maple - PDE substitution
Feb
8
answered How to simplify an equation and remove the denominator in Maple?
Feb
1
answered Maple plot the $l^p$ balls: $\{(x,y) \mid |x|^p + |y|^p \le 1\}$ for $p = 1,…,10$
Feb
1
answered Difference for summation in maple
Jan
21
answered How to plot $(1+a)\left(1-\frac{a}{\sqrt{e}}\int_{0}^{1}x^{a-1}\exp\left\{-\frac{x\ln x}{2(1-x)}\right\}\,{\rm d}x\right)$?
Jan
21
answered Exponential Integral difference between Maple and Matlab
Dec
13
comment “Invalid sequence” in Maple
Also, if I interpreted correctly then it's understandable that one might be thrown by the inefficiency of the original code. Even proc(i, l) [op(l[1..i-1]),op(l[i+1..nops(l)])]; end proc or proc(i, l) [seq(l[k],k=1..i-1),seq(l[k],k=i+1..nops(l))]; end proc would be bearable. One can only wonder whether append and lengthOfList also use loops to build...
Dec
13
comment “Invalid sequence” in Maple
Wasn't the original question about a proc that would remove the i'th entry of the list. That's not the same as your code (and Carl's first comment's code) which removes instances of parameter i from the list. If I am interpreting the goal correctly then a terser and more efficient way would be the commonplace proc(i,l) subsop(i=NULL,l); end proc.
Dec
7
answered evalf integration with multiple free constants
Nov
24
comment What is an equivalent version of maple software in linux?
Focus on what kind of computations you want to do, and whether you need a graphical interface, etc. FreeMat will not provide the general advanced math that a Computer Algebra System like Maple does. But if you actually want mostly scientific and engineering applications then consider Scilab before FreeMat, as it's functionality is broader and more recently developed. Sage can get you more of the advanced math than does FreeMat (and interface with your Scilab too). Take a look at this comparison: en.wikipedia.org/wiki/Comparison_of_numerical_analysis_software
Nov
10
answered Solve nonlinear systems of trigonometric equations
Oct
14
answered Maple double sums: summation order